Core data issue Swift - swift

Question

Hello I am currently following a Swift tutorial which uses the old version of Swift and I am not able to follow this as I believe the syntax has changed in the newer version of Swift.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
var context:NSManagedObjectContext = appDel.managedObjectContext
var newUser = NSEntityDescription.insertNewObjectForEntityForName("users", inManagedObjectContext: context) as NSManagedObject
newUser.setValue("Joe", forKey: "username")
newUser.setValue("pass", forKey: "password")
do {
try context.save()
} catch let error {
print("Couldn't save user data")
print(error)
}
let request = NSFetchRequest(entityName: "Users")
request.returnsObjectsAsFaults = false
// var results = context.executeFetchRequest(request)
do {
var results =
try context.executeFetchRequest(request)
results = results as! [NSManagedObject]
} catch let error as NSError {
print(error)
}
for result: AnyObject in results {
print(results)
}
}
The error I am receiving is to do with the results on the line for result: AnyObject in results and the error is unresolved identifier 'results' which is giving me the impression that this should be declared somewhere as a variable as it is currently unresolved but I cannot figure out how to fix this, any help would be greatly appreciated, thanks!

Answer 1

do {
var results = try context.executeFetchRequest(request)
results = results as! [NSManagedObject]
} catch let error as NSError {
print(error)
}
for result: AnyObject in results {
print(results)
}
results only has scope inside the do block there. You need to move the processing of the array inside the do:
do {
var results = try context.executeFetchRequest(request)
results = results as! [NSManagedObject]
for result in results {
print(results)
}
} catch let error as NSError {
print(error)
}
Also there's no need to lose information by casting as AnyObject.

Answer 2

With the new API's against CoreData (in Swift 3.0) you should do:
let request = NSFetchRequest<Users>(entityName: "Users")
request.returnsObjectsAsFaults = false
do {
var results =
try context.fetch(request)
// `results` will here be [Users]
} catch let error as NSError {
print(error)
}
The new signature of fetch is fetch<T : NSFetchRequestResult>(_ request: NSFetchRequest<T>) throws -> [T] where T is the same as provided in <HERE> (ex. NSFetchRequest<Users>)